Comfortable healthy males will crow in the morning. .. hens will lay eggs... noway to tell from pics.. only the common coutrix quail can be told by the lighter color for fenales and darker for males...
Check out this link. About 1/3 of the way down the page, there is a way to determine the sex for males. For quail that have white on them (like tuxedos, english whites and A&M's), this is the only way to determine the sex.
Also, as Majd has stated, the males will crow... and in my experience, they don't just crow during the day... they crow 24/7.
I hope this helps,